Here are the list of updates that impacted dkong between MAME 0.147 and MAME 0.147u1:

Monday 17th September, 2012http://mame.dorando.at/svn/?rev=17962
Memory handler normalization, part 1.
READ/WRITE_DEVICE*_HANDLERs are now passed an
address_space &, and the 8-bit variants get a mem_mask
as well. This means they are now directly compatible
with the member function delegates. Added a generic
address space to the driver_device that can be used
when no specific address space is available. Also
added DECLARE_READ/WRITE_DEVICE*_HANDLER macros to
declare device callbacks with default mem_mask
parameters

http://mame.dorando.at/svn/?rev=17964
Memory handler normalization, part 2. Change legacy
read/write handlers to take an address_space & instead
of an address_space *. Also update pretty much all other
functions to take a reference where appropriate.

http://mame.dorando.at/svn/?rev=17965
Memory handler cleanup 3. Add mem_mask parameter
to 8-bit handlers to match the others. To ease
pain, added DECLARE_READ/WRITE_HANDLER macros that
set up a default parameter. Also updated devcb so
that the handlers can be called with or without the
mem_mask.

http://mame.dorando.at/svn/?rev=18028
Since nobody checks for NULLs anyway, make
device_memory_interface::space() assert against NULL and
return a reference, and pushed references throughout all
address space usage in the system. Added a has_space()
method to check for those rare case when it is ambiguous.

Also reinstated the generic space and added fatal error
handlers if anyone tries to actually read/write from it.

The above appears to be the strongest candidate for the regression as there are a couple of references to "DKONG_RADARSCP_CONVERSION".

No.14903

tedgreen

Developer

Mar 29, 2018, 16:18

Changing the blue radarscp_net_info from RES_NET_AMP_EMITTER to RES_NET_AMP_DARLINGTON on line 133 of video/dkong.cpp seems to improve the blue background level.
Perhaps the dkong conversion has the darlington pair for blue level.

No.14906

trebor

Tester

Mar 31, 2018, 14:06

Confirmed and *THANK YOU* tedgreen!

Tested under MAME 0.196, changing the blue radarscp_net_info from RES_NET_AMP_EMITTER to RES_NET_AMP_DARLINGTON on line 133 of video/dkong.cpp, fixes the problem.

No.16036

MetalGod

Senior Tester

Jan 15, 2019, 16:21

It seems the provided solution was never integrated into official mame.